JP7390439B2 - Terminals, wireless communication methods and systems - Google Patents

Description

The present disclosure relates to a terminal, a wireless communication method, and a system in a next-generation mobile communication system.

In UMTS (Universal Mobile Telecommunications System) networks, Long Term Evolution (LTE) has been specified for the purpose of higher data rates, lower delays, etc. (Non-Patent Document 1). Additionally, LTE-A (LTE Advanced, LTE Rel. 10, 11, 12, 13) was specified for the purpose of further increasing capacity and sophistication of LTE (LTE Rel. 8, 9).

Successor systems of LTE (for example, FRA (Future Radio Access), 5G (5th generation mobile communication system), 5G+ (plus), NR (New Radio), NX (New radio access), FX (Future generation radio access), LTE (also referred to as Rel. 14 or 15 or later) is also being considered.

3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010

In future wireless communication systems (hereinafter also simply referred to as NR), control of channel/signal transmission/reception processing based on a transmission configuration indication (TCI) state is being considered. Furthermore, in NR, it is being considered to perform multi-slot transmission or multi-slot reception for some channels/signals.

However, based on the NR specifications that have been considered so far, there is a possibility that the TCI state applied during multi-slot may be changed, but whether such a change is allowed is still under consideration. is not progressing. If this control is not clarified, there is a risk that communication throughput will decrease due to discrepancies in recognition of TCI states regarding multi-slot transmission and reception between the base station and user terminals.

Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a system that can appropriately control the TCI state of a multi-slot channel/signal.

In a terminal according to an aspect of the present disclosure, a spatial relationship between a transmitting unit that performs physical uplink control channel (PUCCH) transmission in multi-slots and a PUCCH used for PUCCH transmission in the multi-slots is such that and a control unit that controls so as not to be changed during the process .

According to one aspect of the present disclosure, it is possible to appropriately control the TCI state of a multi-slot channel/signal.

FIG. 1 is an illustration of the problem related to activation of TCI states based on MAC CE. FIG. 2 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 3 is a diagram illustrating an example of the overall configuration of a base station according to an embodiment. FIG. 4 is a diagram illustrating an example of a functional configuration of a base station according to an embodiment. FIG. 5 is a diagram illustrating an example of the overall configuration of a user terminal according to an embodiment. FIG. 6 is a diagram illustrating an example of a functional configuration of a user terminal according to an embodiment. FIG. 7 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment.

(QCL/TCI)
In NR, user equipment (UE) uses information (QCL information) regarding quasi-co-location (QCL) of channels (e.g., PDCCH (Physical Downlink Control Channel), PDSCH, PUCCH, etc.). Therefore, it is being considered to control the reception processing (e.g., demapping, demodulation, decoding, reception beamforming, etc.) and transmission processing (e.g., mapping, modulation, encoding, precoding, transmission beamformation, etc.) of the channel. ing.

Here, QCL is an index indicating statistical properties of a channel. For example, when one signal/channel and another signal/channel have a QCL relationship, the Doppler shift, Doppler spread, and average delay are calculated between these different signals/channels. ), delay spread, and spatial parameters (e.g., Spatial Rx Parameter) can be assumed to be the same (QCL with respect to at least one of these). You may.

Note that the spatial reception parameters may correspond to the UE's receive beam (eg, receive analog beam), and the beam may be identified based on the spatial QCL. QCL (or at least one element of QCL) in this disclosure may be read as sQCL (spatial QCL).

A plurality of types (QCL types) may be defined for QCL. For example, there may be four QCL types A-D with different parameters (or sets of parameters) that can be assumed to be the same, as shown below:
・QCL type A: Doppler shift, Doppler spread, average delay and delay spread,
・QCL type B: Doppler shift and Doppler spread,
・QCL type C: average delay and Doppler shift,
-QCL type D: Spatial reception parameters.

The Transmission Configuration Indication (TCI) state (TCI-state) may indicate (may include) QCL information. The TCI state is, for example, the difference between a target channel (or a reference signal (RS: Reference Signal) for the channel) and another signal (for example, another downlink reference signal (DL-RS)). The information may be information related to QCL, and may include, for example, at least one of information related to DL-RS related to QCL (DL-RS related information) and information indicating the QCL type (QCL type information).

The DL-RS related information may include at least one of information indicating a DL-RS having a QCL relationship and information indicating resources of the DL-RS. For example, when a plurality of reference signal sets (RS sets) are configured in the UE, the DL-RS related information indicates the channel (or port for the channel) and QCL relationship among the RSs included in the RS set. It may also indicate at least one of the DL-RS that it has, resources for the DL-RS, and the like.

Here, at least one of the RS and DL-RS for a channel includes a synchronization signal (SS), a broadcast channel (PBCH), a synchronization signal block (SSB), a mobility reference signal ( At least one of the following: Mobility RS (MRS), Channel Satate Information-Reference Signal (CSI-RS), DeModulation Reference Signal (DMRS), and beam-specific signals, or an extension of these , or may be a signal configured by changing (for example, a signal configured by changing at least one of density and period).

The synchronization signal may be, for example, at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). The SSB may be a signal block including a synchronization signal and a broadcast channel, and may be called an SS/PBCH block or the like.

Note that the TCI state may correspond to a beam. For example, the UE may assume that channels/reference signals in different TCI states are transmitted using different beams.

<TCI status for PDSCH>
Information regarding the QCL between the PDSCH (or the DMRS antenna port associated with the PDSCH) and a given DL-RS may be referred to as the TCI state for the PDSCH.

The UE may be notified (set) of M (M≧1) TCI states (M QCL information for PDSCH) for PDSCH by upper layer signaling. Note that the number M of TCI states set in the UE may be limited by at least one of the UE capability and the QCL type.

In the present disclosure, the upper layer signaling may be, for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, broadcast information, or a combination thereof.

The MAC signaling may use, for example, a MAC control element (MAC CE), a MAC PDU (protocol data unit), or the like. The broadcast information may be, for example, a master information block (MIB), a system information block (SIB), a minimum system information (RMSI), or the like.

Downlink Control Information (DCI) used for PDSCH scheduling may include a predetermined field (for example, may be called a TCI field, TCI status field, etc.) indicating the TCI status for the PDSCH. . The DCI may be used for scheduling PDSCH of one cell, and may be called, for example, DL DCI, DL assignment, DCI format 1_0, DCI format 1_1, etc.

Whether or not the TCI field is included in the DCI may be controlled by information notified from the base station to the UE. The information may be information (TCI-PresentInDCI) indicating whether a TCI field exists in the DCI (present or absent). The information may be set in the UE by, for example, higher layer signaling.

If the DCI includes a TCI field of x bits (e.g., x=3), the base station sends up to 2 ^x (e.g., 8 if x=3) types of TCI states to the UE using upper layer signaling. It may be set in advance. The value of the TCI field in the DCI (TCI field value) may indicate one of the TCI states preset by upper layer signaling.

If more than eight types of TCI states are configured in the UE, the MAC CE may be used to activate (or specify) eight or fewer TCI states. The MAC CE may be referred to as TCI States Activation/Deactivation for UE-specific PDSCH MAC CE. The value of the TCI field within the DCI may indicate one of the TCI states activated by the MAC CE.

The MAC CE specifies a TCI state mapped to the code point of the TCI field of the DCI among TCI state IDs (TCI state IDs) set by RRC signaling, and is used to activate the TCI state. Activated TCI states may be mapped to code point values 0 to 2 ^x −1 (eg, 7 if x=3) in the TCI field in ascending or descending order of TCI state ID.

Letting n be the slot in which the UE transmits HARQ-ACK (Hybrid Automatic Repeat reQuest ACKnowledgement) for the PDSCH that provided the above MAC CE, activation/deactivation based on the MAC CE (TCI field in DCI) and the TCI state) may be applied from slot n+3*(number of slots in a subframe)+1. That is, in slot n+3*(number of slots in a subframe)+1, updating of the code point of the TCI field based on the above MAC CE may be effective.

The time offset between the reception of the DL DCI and the reception of the PDSCH corresponding to the DCI is set to a predetermined threshold ("Threshold", "Threshold for offset between a DCI indicating a TCI state and a PDSCH scheduled by the DCI", "Threshold"). -Sched-Offset" or above), the UE shall select one or more RSs in the RS set for the QCL type parameter given by the TCI state indicated by the DCI and one or more of the PDSCHs of the serving cell. It may be assumed that the antenna port of the DMRS port group is the QCL.

The predetermined threshold may be based on the UE capability, for example on the delay required for PDCCH decoding and beam switching. The information on the predetermined threshold value may be set by the base station using upper layer signaling, or may be transmitted from the UE to the base station.

Further, if the time offset between the reception of the DL DCI and the PDSCH corresponding to the DCI is less than the above-described predetermined threshold, the UE determines that the UE has one or more control resource sets (CORESET). One of the PDSCHs of the serving cell based on the TCI state used for PDCCH QCL notification corresponding to the lowest CORESET-ID (ID for identification of CORESET) in the latest (latest) slot configured. Even assuming that the antenna port of the above DMRS port group is QCL (e.g., the antenna port is DL-RS and QCL based on the activated TCI state for the CORESET corresponding to the minimum CORESET-ID). good.

<Spatial relationships for PUCCH>
For PUCCH, what corresponds to the TCI state may be expressed as a spatial relation. In Rel-15 NR, RRC PUCCH configuration information (“PUCCH-Config” information element) can include spatial relationship information between a predetermined RS and PUCCH. The predetermined RS may be at least one of SSB, CSI-RS, and measurement reference signal (SRS).

If the spatial relationship information regarding the SSB or CSI-RS and the PUCCH is configured, the UE shall transmit the PUCCH using the same spatial domain filter as the spatial domain filter for reception of the SSB or CSI-RS. Good too. That is, in this case, the UE may assume that the UE receive beam for SSB or CSI-RS and the UE transmit beam for PUCCH are the same.

If the UE is configured with spatial relationship information regarding the SRS and the PUCCH, the UE may transmit the PUCCH using the same spatial domain filter as that for transmission of the SRS. That is, in this case, the UE may assume that the SRS UE transmission beam and the PUCCH UE transmission beam are the same.

Note that the spatial domain filter for base station transmission, the downlink spatial domain transmission filter, and the base station transmission beam may be interchanged with each other. A spatial domain filter for reception of a base station, an uplink spatial domain receive filter, and a receive beam of a base station may be interchanged.

Also, the spatial domain filter for UE transmission, uplink spatial domain transmission filter, and UE transmission beam may be interchanged. A spatial domain filter for UE reception, a downlink spatial domain receive filter, and a UE receive beam may be interchanged.

When more than one piece of spatial relation information regarding PUCCH is configured, PUCCH spatial relation activation/deactivation MAC CE (PUCCH spatial relation activation/deactivation MAC CE) is used to configure information on one PUCCH resource at a certain time. One PUCCH spatial relationship is controlled to be active.

The MAC CE may include information such as an applicable serving cell ID, BWP (Bandwidth Part) ID, and PUCCH resource ID.

The UE shall perform activation/deactivation based on the MAC CE (corresponding configuration of the spatial domain filter based on the MAC CE) 3 ms after the slot of transmitting the HARQ-ACK for the PDSCH that provided the MAC CE. ) may be applied for PUCCH transmission.

(Multi-slot transmission/reception)
In NR, multi-slot transmission or multi-slot reception is being considered for some channels. Multi-slot transmission (reception) is transmission (reception) over multiple slots, and may also be called slot aggregation, repetition transmission (reception), or the like. Multi-slot transmission (reception) can be expected to expand coverage and improve reception quality.

For example, if the UE is configured to repeatedly transmit (receive) a channel using upper layer signaling, physical layer signaling (e.g., DCI), or a combination thereof, the UE may repeatedly transmit (receive) that channel. . In each slot of multi-slot transmission (reception), signals with the same content may be transmitted (received), or signals with different content may be transmitted (received).

For multi-slot PUSCH (PUSCH repetition), the repetition factor is configured in the UE by upper layer signaling (e.g. RRC parameter "pusch-AggregationFactor" for PUSCH and RRC parameter "repK" for configured grant PUSCH). Good too.

For multi-slot PDSCH (PDSCH repetition), the repetition factor may be configured to the UE by higher layer signaling (eg, RRC parameter "pdsch-AggregationFactor").

Multi-slot PUCCH (PUCCH repetition) may be configured in the UE for certain formats (eg, PUCCH formats 1, 3 and 4 where the transmission period is 4 or more symbols). A repetition factor (for example, a parameter "nrofSlots" included in "PUCCH-FormatConfig" of RRC) may be set in common for all PUCCH formats 1, 3, and 4.

Note that in the present disclosure, the repetition factor and the repetition number may be read interchangeably.

For multi-slot PDSCH, it is contemplated that the scheduling delay is defined as the time between the last symbol of the PDCCH and the first symbol of the PDSCH of the first scheduled slot. In this case, the TCI state of the multi-slot PDSCH may be determined based on the scheduling offset of the first PDSCH slot rather than the scheduling offset of each PDSCH slot.

Alternatively, for multi-slot PDSCH, it has been considered that the scheduling delay is defined as the time between the last symbol of the PDCCH and the first symbol of the PDSCH of each scheduled slot. . In this case, the TCI state of the multi-slot PDSCH may be determined based on the time from the end of the last symbol of the PDCCH carrying the scheduling DL DCI to the start of the first symbol of the corresponding PDSCH of each PDSCH slot. .

If the time offset between the reception of the DCI and the reception of the slot of the PDSCH corresponding to the DCI is smaller than the predetermined threshold ("Threshold-Sched-Offset"), the PDSCH is scheduled to be the latest (latest or recent). ) may apply a default QCL (TCI state) based on the lowest CORESET ID in the slot.

By the way, as mentioned above, it is being considered to control activation of TCI states, spatial relationships, etc. using MAC CE. However, studies have not yet progressed on how to determine the setting of TCI states for multi-slot transmission/reception. This problem will be explained with reference to FIG.

FIG. 1 is an illustration of the problem related to activation of TCI states based on MAC CE. In this example, it is assumed that the predetermined threshold ("Threshold-Sched-Offset") = 4 slots, the number of slots in a subframe = 1, and the K ₀ indicated by the DCI is 3.

In slot #0, the UE receives a DCI that schedules a multi-slot PDSCH with repetition number=8. Here, it is assumed that the value indicated by the TCI field of the DCI is 1 (“001”), which corresponds to TCI state 1 activated by the MAC CE.

Now, the UE starts receiving the multi-slot PDSCH from slot #3 based on the DCI. According to the previous NR considerations, the UE may assume that the TCI state of the PDSCH in slot #3 (first repetition) is the default TCI state, or may assume that the TCI state is invalid. It's okay.

From slot #4, the UE may determine the TCI state of the multi-slot PDSCH based on the TCI field of the scheduling DCI, and may determine that the TCI state is 1 and perform reception processing.

Meanwhile, in slot #4, the UE separately receives a UE-specific PDSCH TCI state activation/deactivation MAC CE. It is assumed that the MAC CE at least indicates mapping of TCI state X (X may be other than 1) to code point value 1 of the TCI field.

The UE transmits HARQ-ACK (ACK or NACK) for the MAC CE in slot #6. In this example, following the activation timing application described above, the UE can utilize the updated TCI state mapping based on the above MAC CE from the second illustrated slot #0 (eighth repetition). .

However, as shown in FIG. 1, no study has yet progressed on whether or not it is permissible to change the TCI state applied in the middle of a multi-slot. In other words, in the case of a multi-slot PDSCH, it is permitted that the time offset between the reception of a DCI and the reception of a PDSCH slot corresponding to the DCI is smaller than the predetermined threshold ("Threshold-Sched-Offset"). No progress has been made in considering whether or not to do so. Further, consideration has not yet progressed as to whether or not it is permissible to change the applied TCI state based on MAC CE during multi-slot transmission/reception.

Similar problems related to TCI state control can be considered for multi-slot transmission/reception other than multi-slot PDSCH (for example, multi-slot PUCCH).

If these controls are not clarified, processing at the base station/UE may become complicated, or discrepancies in recognition of the TCI status regarding multi-slots may occur between the base station and UE, making it difficult for the multi-slots to be processed appropriately. communication throughput may decrease.

Therefore, the present inventors came up with a method for appropriately controlling the TCI state of channels or signals transmitted and received in multiple slots.

Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. The wireless communication methods according to each embodiment may be applied singly or in combination.

(Wireless communication method)
<First embodiment>
In the first embodiment, the UE does not change the TCI state of the multi-slot PDSCH in a certain serving cell or a certain BWP.

The UE determines that the time offset between the reception of the DL DCI and the reception of the first slot (or first repetition) of the multi-slot PDSCH corresponding to the DL DCI is the predetermined threshold value ("Threshold-Sched-Offset"). It may not be expected to receive such a DL DCI indicating that it is smaller. That is, the base station may not be allowed to indicate such a time offset to the UE.

Note that the time offset may be determined based on the slot offset _K0 . Here, the UE may be configured with several candidates for the slot offset K ₀ by upper layer signaling, one of which may be indicated by the time domain resource allocation field of the DCI. For example, the UE may not expect K ₀ to be set or indicated to be less than the predetermined threshold (“Threshold-Sched-Offset”).

In addition, the UE may complete the activation or deactivation of the TCI state during the middle (duration period) of the multi-slot PDSCH (for example, corresponds to the above-mentioned slot n+3*(number of slots in a subframe)+1). , may not expect to receive TCI state activation/deactivation MAC CE for UE-specific PDSCH. That is, the base station may not be allowed to send such a MAC CE to the UE.

Further, the UE may receive a UE-specific TCI state activation/deactivation MAC CE for PDSCH such that activation or deactivation of the TCI state is completed during the multi-slot PDSCH.

In this case, the UE does not need to change the TCI state of the multi-slot PDSCH that has already started reception even when the activation or deactivation based on the MAC CE is completed. That is, the UE may assume that the TCI state of the multi-slot PDSCH is not changed during reception. After the UE completes reception of all slots of the multi-slot PDSCH, the UE may perform (or may complete) activation or deactivation based on the received MAC CE.

According to the first embodiment described above, the TCI state applied to multi-slots can be appropriately controlled.

<Second embodiment>
In a second embodiment, the UE may change the TCI state of a multi-slot PDSCH in a certain serving cell or a certain BWP.

The UE may change the TCI state in the middle of a multi-slot PDSCH in one or both of the following cases:
(1) The time offset between the reception of the DL DCI and the reception of the first slot (or first repetition) of the multi-slot PDSCH corresponding to the DL DCI is determined by the predetermined threshold value ("Threshold-Sched-Offset"). ), if the corresponding DL DCI is received indicating that the DCI is smaller than
(2) When a UE-specific PDSCH TCI state activation/deactivation MAC CE is received such that activation or deactivation of the TCI state is completed in the middle of the multi-slot PDSCH.

In the case of (1) above, the UE selects the latest ("Threshold-Sched-Offset") for the PDSCH of the slot whose time offset from the reception of the DL DCI corresponds to less than a predetermined threshold ("Threshold-Sched-Offset") among the multi-slot PDSCHs. A default QCL (TCI state) based on the lowest CORESET ID in the slot (latest or recent) may be assumed, and for PDSCH in slots where this is not the case (the above time offset falls above the above predetermined threshold), the above QCL (TCI status) based on the TCI field included in DL DCI may be followed.

In the case of (2) above, the UE, for a multi-slot PDSCH whose activation or deactivation based on the MAC CE is completed before the timing, the UE uses the code point of the TCI field before the update based on the MAC CE. The QCL (TCI state) may be determined using the mapping of , or the default QCL (TCI state) described above may be assumed; otherwise, for PDSCH of a slot (same as or after the above completion timing), The QCL (TCI state) may be determined using the updated code point mapping of the TCI field based on the MAC CE.

For example, the value of the TCI field of a DCI that schedules a multi-slot PDSCH is i, and the TCI state ID corresponding to TCI field = i is the first TCI state ID before updating based on MAC CE, and the first TCI state ID after updating. Consider the case where the TCI state ID is 2 (different from the first TCI state ID).

In this case, the UE may receive the PDSCH based on the first TCI state ID before completing the activation based on the MAC CE, and after completing the activation, the UE may receive the PDSCH based on the second TCI state ID. PDSCH may be received.

Also, if the first TCI state ID is still active after the update (e.g., the code point is different (mapped to TCI field = j (j≠i)) but is activated by the above MAC CE) In this case, the UE may follow the first TCI state ID over all slots of the multi-slot PDSCH, regardless of the activation completion of the MAC CE. According to this configuration, during a multi-slot, if the same TCI state is continuously active, the TCI state applied to the multi-slot is not changed, and if not, the TCI state is switched to another TCI state. control is possible.

According to the second embodiment described above, the TCI state applied to multi-slots can be appropriately controlled.

<Modified example>
In each of the embodiments described above, a multi-slot PDSCH has been described, but the scope of application of the invention described in this disclosure is not limited to this. The multi-slot in the present disclosure may be read as a single slot, a cross slot, or the like.

For example, "first slot of multi-slot PDSCH" in the present disclosure may be replaced with "slot of PDSCH." Furthermore, "during the multi-slot PDSCH" may be read as "from the reception of the DCI that schedules the PDSCH to the slot of the PDSCH."

In addition, each of the above-described embodiments includes multi-slot transmission and reception of multi-slots other than multi-slot PDSCH (e.g., multi-slot PUCCH, multi-slot PUSCH), multi-slot transmission and reception of reference signals (e.g., CSI-RS, SSB, DMRS, SRS, etc.), etc. The same may be applied to.

For example, when multislot PDSCH in each of the above embodiments is replaced with multislot PUCCH, reception of PDSCH may be replaced with transmission of PUCCH. When rereading as PUCCH transmission, the TCI state in each of the above-described embodiments may similarly be replaced as spatial relationship or spatial relationship information.

In this case, the time offset between the reception of the DL DCI and the transmission of the first slot (or first repetition) of the multislot PUCCH corresponding to the DL DCI is the slot offset K ₀ , the number of repetitions of the PDSCH, the reception of the PDSCH The timing may be determined based on at least one of the timing from the time to the transmission of the HARQ-ACK corresponding to the PDSCH (PDSCH-to-ACK timing, which may also be referred to as “K ₁ ”, etc.).

For example, the UE may not expect _K1 to be set or instructed to be less than the predetermined threshold ("Threshold-Sched-Offset").

Note that how to deal with TCI state activation/deactivation requested in the middle of a multi-slot in a certain serving cell or a certain BWP may depend on the implementation of the UE. The UE may switch which of the above-described embodiments to determine the multi-slot TCI state based on some condition.

(wireless communication system)
The configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above-described embodiments of the present disclosure or a combination thereof.

FIG. 2 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. In the wireless communication system 1, at least one of carrier aggregation (CA) and dual connectivity (DC) that integrates a plurality of basic frequency blocks (component carriers) each having a system bandwidth (for example, 20 MHz) as one unit is applied. Can be done.

Note that the wireless communication system 1 includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), and 5G. (5th generation mobile communication system), NR (New Radio), FRA (Future Radio Access), New-RAT (Radio Access Technology), etc., or a system that realizes these.

The wireless communication system 1 may support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple RATs (Radio Access Technologies). MR-DC has dual connectivity between LTE and NR, where the LTE (E-UTRA) base station (eNB) becomes the master node (MN) and the NR base station (gNB) becomes the secondary node (SN). EN-DC: E-UTRA-NR Dual Connectivity), dual connectivity between NR and LTE where the NR base station (gNB) becomes the MN and the LTE (E-UTRA) base station (eNB) becomes the SN. NE-DC: NR-E-UTRA Dual Connectivity), etc. may also be included.

The wireless communication system 1 has dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NN-DC: NR-NR Dual Connectivity) in which both the MN and SN are NR base stations (gNB)). ) may be supported.

The wireless communication system 1 includes a base station 11 that forms a macro cell C1 with relatively wide coverage, and base stations 12 (12a-12c) that are located within the macro cell C1 and form a small cell C2 that is narrower than the macro cell C1. We are prepared. Further, user terminals 20 are arranged in the macro cell C1 and each small cell C2. The arrangement, number, etc. of each cell and user terminal 20 are not limited to the embodiment shown in the figure.

User terminal 20 can be connected to both base station 11 and base station 12. It is assumed that the user terminal 20 uses the macro cell C1 and the small cell C2 simultaneously using CA or DC. Further, the user terminal 20 may apply CA or DC using a plurality of cells (CC).

Communication can be performed between the user terminal 20 and the base station 11 using a relatively low frequency band (for example, 2 GHz) and a narrow bandwidth carrier (also called an existing carrier, legacy carrier, etc.). On the other hand, a carrier with a relatively high frequency band (for example, 3.5 GHz, 5 GHz, etc.) and a wide bandwidth may be used between the user terminal 20 and the base station 12, and a carrier with a wide bandwidth may be used between the user terminal 20 and the base station 11. The same carrier may be used. Note that the configuration of the frequency band used by each base station is not limited to this.

Further, the user terminal 20 can perform communication using at least one of time division duplex (TDD) and frequency division duplex (FDD) in each cell. Furthermore, each cell (carrier) may apply a single numerology or a plurality of different numerologies.

The base station 11 and the base station 12 (or between the two base stations 12) may be connected by wire (for example, optical fiber, X2 interface, etc. compliant with CPRI (Common Public Radio Interface)) or wirelessly. good.

The base station 11 and each base station 12 are each connected to an upper station device 30 and connected to the core network 40 via the upper station device 30. Note that the upper station device 30 includes, for example, an access gateway device, a radio network controller (RNC), a mobility management entity (MME), etc., but is not limited thereto. Further, each base station 12 may be connected to the upper station device 30 via the base station 11.

Note that the base station 11 is a base station with relatively wide coverage, and may be called a macro base station, aggregation node, eNB (eNodeB), transmission/reception point, or the like. The base station 12 is a base station with local coverage, such as a small base station, micro base station, pico base station, femto base station, HeNB (Home eNodeB), RRH (Remote Radio Head), transmission/reception point, etc. may be called. Hereinafter, when base stations 11 and 12 are not distinguished, they will be collectively referred to as base station 10.

Each user terminal 20 is a terminal compatible with various communication systems such as LTE, LTE-A, and 5G, and may include not only mobile communication terminals (mobile stations) but also fixed communication terminals (fixed stations).

In the wireless communication system 1, Orthogonal Frequency Division Multiple Access (OFDMA) is applied to the downlink as a radio access method, and Single Carrier Frequency Division Multiple Access (SC-FDMA) is applied to the uplink. At least one of Frequency Division Multiple Access) and OFDMA is applied.

OFDMA is a multicarrier transmission method that divides a frequency band into a plurality of narrow frequency bands (subcarriers) and performs communication by mapping data to each subcarrier. SC-FDMA is a single-carrier transmission system that reduces interference between terminals by dividing the system bandwidth into bands consisting of one resource block or consecutive resource blocks for each terminal, and allowing multiple terminals to use different bands. It is a method. Note that the uplink and downlink wireless access methods are not limited to a combination of these methods, and other wireless access methods may be used.

In the wireless communication system 1, a downlink shared channel (PDSCH: Physical Downlink Shared Channel) shared by each user terminal 20, a broadcast channel (PBCH: Physical Broadcast Channel), a downlink control channel, etc. are used as downlink channels. User data, upper layer control information, SIB (System Information Block), etc. are transmitted through the PDSCH. Furthermore, MIB (Master Information Block) is transmitted by the PBCH.

Downlink control channels include PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced Physical Downlink Control Channel), PCFICH (Physical Control Format Indicator Channel), PHICH (Physical Hybrid-ARQ Indicator Channel), and the like. The PDCCH transmits downlink control information (DCI) including scheduling information for at least one of the PDSCH and the PUSCH.

Note that the DCI that schedules DL data reception may be called a DL assignment, and the DCI that schedules UL data transmission may be called a UL grant.

The number of OFDM symbols used for PDCCH may be transmitted by PCFICH. Delivery confirmation information (for example, also referred to as retransmission control information, HARQ-ACK, ACK/NACK, etc.) of HARQ (Hybrid Automatic Repeat reQuest) for PUSCH may be transmitted by PHICH. EPDCCH is frequency division multiplexed with PDSCH (downlink shared data channel), and is used for transmission of DCI and the like like PDCCH.

In the wireless communication system 1, uplink channels include a physical uplink shared channel (PUSCH) shared by each user terminal 20, a physical uplink control channel (PUCCH), and a random access channel (PRACH). Physical Random Access Channel) etc. are used. User data, upper layer control information, etc. are transmitted through the PUSCH. Furthermore, downlink radio quality information (CQI: Channel Quality Indicator), delivery confirmation information, scheduling request (SR: Scheduling Request), etc. are transmitted by PUCCH. A random access preamble for establishing a connection with a cell is transmitted by PRACH.

In the wireless communication system 1, downlink reference signals include a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), and a demodulation reference signal (DMRS). DeModulation Reference Signal), positioning reference signal (PRS), etc. are transmitted. Furthermore, in the wireless communication system 1, measurement reference signals (SRS), demodulation reference signals (DMRS), and the like are transmitted as uplink reference signals. Note that DMRS may be called a user terminal-specific reference signal (UE-specific reference signal). Further, the reference signals to be transmitted are not limited to these.

(base station)
FIG. 3 is a diagram illustrating an example of the overall configuration of a base station according to an embodiment. The base station 10 includes a plurality of transmitting/receiving antennas 101, an amplifier section 102, a transmitting/receiving section 103, a baseband signal processing section 104, a call processing section 105, and a transmission line interface 106. Note that each of the transmitting/receiving antenna 101, the amplifier section 102, and the transmitting/receiving section 103 may be configured to include one or more.

User data transmitted from the base station 10 to the user terminal 20 via the downlink is input from the upper station device 30 to the baseband signal processing unit 104 via the transmission path interface 106.

The baseband signal processing unit 104 processes user data using PDCP (Packet Data Convergence Protocol) layer processing, user data division/combination, RLC layer transmission processing such as RLC (Radio Link Control) retransmission control, and MAC (Medium Access Protocol) layer processing. Control) Transmission processing such as retransmission control (for example, HARQ transmission processing), scheduling, transmission format selection, channel coding, inverse fast Fourier transform (IFFT) processing, and precoding processing is performed in the transmitting and receiving unit. 103. Further, the downlink control signal is also subjected to transmission processing such as channel encoding and inverse fast Fourier transform, and then transferred to the transmitting/receiving section 103.

The transmitter/receiver 103 converts the baseband signal outputted from the baseband signal processor 104 by precoding for each antenna into a radio frequency band and transmits the baseband signal. The radio frequency signal frequency-converted by the transmitting/receiving section 103 is amplified by the amplifier section 102 and transmitted from the transmitting/receiving antenna 101. The transmitting/receiving unit 103 can be configured from a transmitter/receiver, a transmitting/receiving circuit, or a transmitting/receiving device as described based on common recognition in the technical field related to the present disclosure. Note that the transmitting/receiving section 103 may be configured as an integrated transmitting/receiving section, or may be configured from a transmitting section and a receiving section.

On the other hand, regarding uplink signals, a radio frequency signal received by the transmitting/receiving antenna 101 is amplified by the amplifier section 102. The transmitting/receiving section 103 receives the upstream signal amplified by the amplifier section 102. Transmission/reception section 103 frequency-converts the received signal into a baseband signal and outputs it to baseband signal processing section 104 .

The baseband signal processing unit 104 performs fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing, and error correction on user data included in the input uplink signal. Decoding, MAC retransmission control reception processing, RLC layer and PDCP layer reception processing are performed, and then transferred to the upper station device 30 via the transmission path interface 106. The call processing unit 105 performs communication channel call processing (setting, release, etc.), status management of the base station 10, radio resource management, and the like.

The transmission path interface 106 transmits and receives signals to and from the upper station device 30 via a predetermined interface. The transmission line interface 106 also transmits and receives signals (backhaul signaling) to and from other base stations 10 via an inter-base station interface (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), an X2 interface). Good too.

The transmitting/receiving unit 103 may receive the various information described in each of the above embodiments from the user terminal 20 and/or transmit it to the user terminal 20.

FIG. 4 is a diagram illustrating an example of a functional configuration of a base station according to an embodiment. Note that this example mainly shows functional blocks that are characteristic of the present embodiment, and it may be assumed that base station 10 also has other functional blocks necessary for wireless communication.

The baseband signal processing section 104 includes at least a control section (scheduler) 301, a transmission signal generation section 302, a mapping section 303, a reception signal processing section 304, and a measurement section 305. Note that these configurations only need to be included in the base station 10, and some or all of the configurations do not need to be included in the baseband signal processing section 104.

A control unit (scheduler) 301 controls the base station 10 as a whole. The control unit 301 can be configured from a controller, a control circuit, or a control device described based on common recognition in the technical field related to the present disclosure.

The control unit 301 controls, for example, signal generation in the transmission signal generation unit 302, signal allocation in the mapping unit 303, and the like. The control unit 301 also controls signal reception processing in the received signal processing unit 304, signal measurement in the measurement unit 305, and the like.

The control unit 301 performs scheduling (e.g., resources control). Further, the control unit 301 controls the generation of downlink control signals, downlink data signals, etc. based on the result of determining whether retransmission control is necessary for uplink data signals.

The control unit 301 controls scheduling of synchronization signals (eg, PSS/SSS), downlink reference signals (eg, CRS, CSI-RS, DMRS), and the like.

The control unit 301 controls forming a transmission beam and/or a reception beam using a digital BF (for example, precoding) by the baseband signal processing unit 104 and/or an analog BF (for example, phase rotation) by the transmission/reception unit 103. You may do so.

Transmission signal generation section 302 generates a downlink signal (downlink control signal, downlink data signal, downlink reference signal, etc.) based on an instruction from control section 301, and outputs it to mapping section 303. The transmission signal generation unit 302 can be configured from a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field related to the present disclosure.

For example, based on an instruction from the control unit 301, the transmission signal generation unit 302 generates a DL assignment for reporting downlink data allocation information and/or a UL grant for reporting uplink data allocation information. Both DL assignments and UL grants are DCI and follow the DCI format. Further, the downlink data signal is subjected to encoding processing, modulation processing, etc. according to the coding rate, modulation method, etc. determined based on channel state information (CSI: Channel State Information) from each user terminal 20.

Mapping section 303 maps the downlink signal generated by transmission signal generation section 302 to a predetermined radio resource based on an instruction from control section 301 and outputs the mapped signal to predetermined radio resources. The mapping unit 303 can be configured from a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field related to the present disclosure.

Received signal processing section 304 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the received signal input from transmitting/receiving section 103 . Here, the received signal is, for example, an uplink signal (uplink control signal, uplink data signal, uplink reference signal, etc.) transmitted from the user terminal 20. The received signal processing unit 304 can be configured from a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field related to the present disclosure.

Received signal processing section 304 outputs information decoded by reception processing to control section 301. For example, when receiving PUCCH including HARQ-ACK, HARQ-ACK is output to control section 301. Further, the received signal processing section 304 outputs the received signal and/or the signal after receiving processing to the measuring section 305.

The measurement unit 305 performs measurements on the received signal. The measurement unit 305 can be configured from a measuring instrument, a measuring circuit, or a measuring device described based on common recognition in the technical field related to the present disclosure.

For example, the measurement unit 305 may perform RRM (Radio Resource Management) measurement, CSI (Channel State Information) measurement, etc. based on the received signal. The measurement unit 305 measures reception power (for example, RSRP (Reference Signal Received Power)), reception quality (for example, RSRQ (Reference Signal Received Quality), SINR (Signal to Interference plus Noise Ratio), SNR (Signal to Noise Ratio)). , signal strength (for example, RSSI (Received Signal Strength Indicator)), propagation path information (for example, CSI), etc. may be measured. The measurement results may be output to the control unit 301.

Note that the transmitting/receiving unit 103 may perform multi-slot transmission or reception of a predetermined channel (for example, PDSCH, PUSCH, PUCCH) and a predetermined reference signal (for example, CSI-RS, SSB, SRS).

The control unit 301 may perform control regarding the multi-slot transmission or reception so that the user terminal 20 can process the change of the TCI state of the multi-slot transmission or reception based on a predetermined assumption.

(user terminal)
FIG. 5 is a diagram illustrating an example of the overall configuration of a user terminal according to an embodiment. The user terminal 20 includes a plurality of transmitting/receiving antennas 201, an amplifier section 202, a transmitting/receiving section 203, a baseband signal processing section 204, and an application section 205. Note that each of the transmitting/receiving antenna 201, the amplifier section 202, and the transmitting/receiving section 203 may be configured to include one or more.

A radio frequency signal received by the transmitting/receiving antenna 201 is amplified by the amplifier section 202. Transmission/reception section 203 receives the downlink signal amplified by amplifier section 202. Transmission/reception section 203 frequency-converts the received signal into a baseband signal and outputs it to baseband signal processing section 204 . The transmitting/receiving unit 203 can be configured from a transmitter/receiver, a transmitting/receiving circuit, or a transmitting/receiving device as described based on common recognition in the technical field related to the present disclosure. Note that the transmitting/receiving section 203 may be configured as an integrated transmitting/receiving section, or may be configured from a transmitting section and a receiving section.

The baseband signal processing unit 204 performs FFT processing, error correction decoding, retransmission control reception processing, etc. on the input baseband signal. Downlink user data is transferred to the application section 205. The application unit 205 performs processing related to layers higher than the physical layer and the MAC layer. Furthermore, among the downlink data, broadcast information may also be transferred to the application unit 205.

On the other hand, uplink user data is input from the application section 205 to the baseband signal processing section 204. The baseband signal processing unit 204 performs transmission processing for retransmission control (for example, HARQ transmission processing), channel encoding, precoding, discrete Fourier transform (DFT) processing, IFFT processing, etc. 203.

The transmitter/receiver 203 converts the baseband signal output from the baseband signal processor 204 into a radio frequency band and transmits it. The radio frequency signal frequency-converted by the transmitting/receiving section 203 is amplified by the amplifier section 202 and transmitted from the transmitting/receiving antenna 201.

FIG. 6 is a diagram illustrating an example of a functional configuration of a user terminal according to an embodiment. Note that in this example, functional blocks that are characteristic of the present embodiment are mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication.

The baseband signal processing section 204 included in the user terminal 20 includes at least a control section 401, a transmission signal generation section 402, a mapping section 403, a received signal processing section 404, and a measurement section 405. Note that these configurations only need to be included in the user terminal 20, and some or all of the configurations do not need to be included in the baseband signal processing section 204.

The control unit 401 controls the entire user terminal 20. The control unit 401 can be configured from a controller, a control circuit, or a control device described based on common recognition in the technical field related to the present disclosure.

The control unit 401 controls, for example, signal generation in the transmission signal generation unit 402, signal allocation in the mapping unit 403, and the like. Further, the control unit 401 controls signal reception processing in the reception signal processing unit 404, signal measurement in the measurement unit 405, and the like.

The control unit 401 obtains the downlink control signal and downlink data signal transmitted from the base station 10 from the received signal processing unit 404. The control unit 401 controls the generation of uplink control signals and/or uplink data signals based on the result of determining whether retransmission control is necessary for downlink control signals and/or downlink data signals.

Further, when the control unit 401 acquires various information notified from the base station 10 from the received signal processing unit 404, the control unit 401 may update parameters used for control based on the information.

Transmission signal generation section 402 generates uplink signals (uplink control signal, uplink data signal, uplink reference signal, etc.) based on instructions from control section 401, and outputs them to mapping section 403. The transmission signal generation unit 402 can be configured from a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field related to the present disclosure.

Transmission signal generation section 402 generates uplink control signals regarding delivery confirmation information, channel state information (CSI), etc., based on instructions from control section 401, for example. Furthermore, the transmission signal generation section 402 generates an uplink data signal based on instructions from the control section 401. For example, when the downlink control signal notified from the base station 10 includes a UL grant, the transmission signal generation section 402 is instructed by the control section 401 to generate an uplink data signal.

Mapping section 403 maps the uplink signal generated by transmission signal generation section 402 to a radio resource based on an instruction from control section 401 and outputs the mapped signal to radio resource. The mapping unit 403 can be configured from a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field related to the present disclosure.

Received signal processing section 404 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the received signal input from transmitting/receiving section 203 . Here, the received signal is, for example, a downlink signal (downlink control signal, downlink data signal, downlink reference signal, etc.) transmitted from the base station 10. The received signal processing unit 404 can be configured from a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field related to the present disclosure. Further, the received signal processing section 404 can constitute a receiving section according to the present disclosure.

Received signal processing section 404 outputs information decoded by reception processing to control section 401. The received signal processing unit 404 outputs, for example, broadcast information, system information, RRC signaling, DCI, etc. to the control unit 401. Further, the received signal processing section 404 outputs the received signal and/or the signal after receiving processing to the measuring section 405.

The measurement unit 405 performs measurements on the received signal. The measurement unit 405 can be configured from a measuring instrument, a measuring circuit, or a measuring device described based on common recognition in the technical field related to the present disclosure.

For example, the measurement unit 405 may perform RRM measurement, CSI measurement, etc. based on the received signal. The measuring unit 405 may measure received power (eg, RSRP), received quality (eg, RSRQ, SINR, SNR), signal strength (eg, RSSI), propagation path information (eg, CSI), and the like. The measurement results may be output to the control unit 401.

Note that the transmitting/receiving unit 203 may perform multi-slot transmission or reception of a predetermined channel (for example, PDSCH, PUSCH, PUCCH) and a predetermined reference signal (for example, CSI-RS, SSB, SRS).

The control unit 401 may make predetermined assumptions regarding the change in the TCI state of multi-slot transmission or reception. For example, the control unit 401 determines that the time offset between the multi-slot transmission or the reception of downlink control information (DCI) that schedules the transmission and the multi-slot transmission or the first slot of the transmission is a predetermined threshold value (for example, There is no need to expect to receive such a DCI indicating that the DCI is less than "Threshold-Sched-Offset").

The control unit 401 performs activation control signaling of the TCI state of the predetermined channel (for example, UE-specific PDSCH TCI state) such that activation or deactivation of the TCI state is completed during the multi-slot transmission or transmission. Activation/Deactivation MAC CE (TCI States Activation/Deactivation for UE-specific PDSCH MAC CE), PUCCH spatial relation Activation/Deactivation MAC CE (PUCCH spatial relation Activation/Deactivation MAC CE, etc.) You don't have to expect that.

Even when the control unit 401 receives activation control signaling of the TCI state of the predetermined channel, such that activation or deactivation of the TCI state is completed during the multi-slot transmission or transmission, It is not necessary to change the TCI state of the predetermined channel midway through (the same TCI state may be applied continuously).

The control unit 401 may allow the TCI state of the predetermined channel to be changed during the multi-slot transmission or during the transmission.

(Hardware configuration)
It should be noted that the block diagram used to explain the above embodiment shows blocks in functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically coupled device, or may be realized using two or more physically or logically separated devices directly or indirectly (e.g. , wired, wireless, etc.) and may be realized using a plurality of these devices. The functional block may be realized by combining software with the one device or the plurality of devices.

Here, functions include judgment, decision, judgement, calculation, calculation, processing, derivation, investigation, exploration, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and consideration. , broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc. Not limited. For example, a functional block (configuration unit) that performs transmission may be called a transmitting unit, a transmitter, or the like. In either case, as described above, the implementation method is not particularly limited.

For example, a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. FIG. 7 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. The base station 10 and user terminal 20 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc. .

Note that in the present disclosure, words such as apparatus, circuit, device, section, unit, etc. can be read interchangeably. The hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured not to include some of the devices.

For example, although only one processor 1001 is shown, there may be multiple processors. Also, the processing may be performed by one processor, or the processing may be performed by two or more processors simultaneously, sequentially, or using other techniques. Note that the processor 1001 may be implemented using one or more chips.

Each function in the base station 10 and the user terminal 20 is performed by, for example, loading predetermined software (program) onto hardware such as a processor 1001 and a memory 1002, so that the processor 1001 performs calculations and communicates via the communication device 1004. This is achieved by controlling at least one of reading and writing data in the memory 1002 and storage 1003.

The processor 1001, for example, operates an operating system to control the entire computer. The processor 1001 may be configured by a central processing unit (CPU) including an interface with a peripheral device, a control device, an arithmetic device, a register, and the like. For example, the baseband signal processing section 104 (204), call processing section 105, etc. described above may be realized by the processor 1001.

Furthermore, the processor 1001 reads programs (program codes), software modules, data, and the like from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and executes various processes in accordance with these. As the program, a program that causes a computer to execute at least part of the operations described in the above embodiments is used. For example, the control unit 401 of the user terminal 20 may be realized by a control program stored in the memory 1002 and operated on the processor 1001, and other functional blocks may be similarly realized.

The memory 1002 is a computer-readable recording medium, and includes at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrical EPROM), RAM (Random Access Memory), and other suitable storage media. It may be composed of one. Memory 1002 may be called a register, cache, main memory, or the like. The memory 1002 can store executable programs (program codes), software modules, and the like to implement a wireless communication method according to an embodiment of the present disclosure.

The storage 1003 is a computer-readable recording medium, such as a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (CD-ROM), etc.), a digital versatile disk, removable disk, hard disk drive, smart card, flash memory device (e.g., card, stick, key drive), magnetic stripe, database, server, or other suitable storage medium. It may be configured by Storage 1003 may also be called an auxiliary storage device.

The communication device 1004 is hardware (transmission/reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, or the like. The communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). It may be composed of. For example, the above-described transmitting/receiving antenna 101 (201), amplifier section 102 (202), transmitting/receiving section 103 (203), transmission path interface 106, etc. may be realized by the communication device 1004. The transmitter/receiver 103 (203) may be physically or logically separated into a transmitter 103a (203a) and a receiver 103b (203b).

The input device 1005 is an input device (eg, keyboard, mouse, microphone, switch, button, sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED (Light Emitting Diode) lamp, etc.) that performs output to the outside. Note that the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

Further, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses for each device.

The base station 10 and user terminal 20 also include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA). It may be configured to include hardware, and a part or all of each functional block may be realized using the hardware. For example, processor 1001 may be implemented using at least one of these hardwares.

(Modified example)
Note that terms explained in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, channel, symbol and signal may be interchanged. Also, the signal may be a message. The reference signal can also be abbreviated as RS (Reference Signal), and may also be called a pilot, a pilot signal, etc. depending on the applied standard. Further, a component carrier (CC) may also be called a cell, a frequency carrier, a carrier frequency, or the like.

A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (eg, 1 ms) that does not depend on numerology.

Here, the numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. Numerology includes, for example, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, transmission and reception. It may also indicate at least one of a specific filtering process performed by the device in the frequency domain, a specific windowing process performed by the transceiver in the time domain, etc.

A slot may be composed of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.) in the time domain. Furthermore, a slot may be a time unit based on numerology.

A slot may include multiple minislots. Each minislot may be made up of one or more symbols in the time domain. Furthermore, a mini-slot may also be called a sub-slot. A minislot may be made up of fewer symbols than a slot. PDSCH (or PUSCH) transmitted in time units larger than minislots may be referred to as PDSCH (PUSCH) mapping type A. PDSCH (or PUSCH) transmitted using minislots may be referred to as PDSCH (PUSCH) mapping type B.

Radio frames, subframes, slots, minislots, and symbols all represent time units for transmitting signals. Other names may be used for the radio frame, subframe, slot, minislot, and symbol. Note that time units such as frames, subframes, slots, minislots, and symbols in the present disclosure may be read interchangeably.

For example, one subframe may be called a Transmission Time Interval (TTI), multiple consecutive subframes may be called a TTI, and one slot or minislot may be called a TTI. It's okay. In other words, at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (for example, 1-13 symbols), or a period longer than 1ms. It may be. Note that the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.

Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, a base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used by each user terminal) to each user terminal on a TTI basis. Note that the definition of TTI is not limited to this.

The TTI may be a transmission time unit of a channel-coded data packet (transport block), a code block, a codeword, etc., or may be a processing unit of scheduling, link adaptation, etc. Note that when a TTI is given, the time interval (for example, the number of symbols) to which transport blocks, code blocks, code words, etc. are actually mapped may be shorter than the TTI.

Note that when one slot or one minislot is called a TTI, one or more TTIs (that is, one or more slots or one or more minislots) may be the minimum time unit for scheduling. Further, the number of slots (minislot number) that constitutes the minimum time unit of the scheduling may be controlled.

A TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, etc. A TTI that is shorter than a normal TTI may be referred to as an abbreviated TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, or the like.

Note that long TTI (for example, normal TTI, subframe, etc.) may be read as TTI with a time length exceeding 1 ms, and short TTI (for example, short TTI, etc.) It may also be read as a TTI having the above TTI length.

A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and may include one or more continuous subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in an RB may be the same regardless of the numerology, and may be 12, for example. The number of subcarriers included in an RB may be determined based on numerology.

Additionally, an RB may include one or more symbols in the time domain and may be one slot, one minislot, one subframe, or one TTI long. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

Note that one or more RBs include physical resource blocks (PRBs), sub-carrier groups (SCGs), resource element groups (REGs), PRB pairs, RB pairs, etc. May be called.

Further, a resource block may be configured by one or more resource elements (REs). For example, 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.

Bandwidth Part (BWP) (also referred to as partial bandwidth) may refer to a subset of consecutive common resource blocks (RB) for a certain numerology in a certain carrier. good. Here, the common RB may be specified by an RB index based on a common reference point of the carrier. PRBs may be defined in a BWP and numbered within that BWP.

The BWP may include a UL BWP (UL BWP) and a DL BWP (DL BWP). One or more BWPs may be configured within one carrier for a UE.

At least one of the configured BWPs may be active and the UE may not expect to transmit or receive a given signal/channel outside of the active BWP. Note that "cell", "carrier", etc. in the present disclosure may be replaced with "BWP".

Note that the structures of the radio frame, subframe, slot, minislot, symbol, etc. described above are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of symbols included in an RB, Configurations such as the number of subcarriers, the number of symbols within a TTI, the symbol length, and the cyclic prefix (CP) length can be changed in various ways.

In addition, the information, parameters, etc. described in this disclosure may be expressed using absolute values, relative values from a predetermined value, or using other corresponding information. may be expressed. For example, radio resources may be indicated by a predetermined index.

The names used for parameters and the like in this disclosure are not limiting in any respect. Furthermore, the mathematical formulas etc. using these parameters may differ from those explicitly disclosed in this disclosure. Since the various channels (Physical Uplink Control Channel (PUCCH), Physical Downlink Control Channel (PDCCH), etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements is not a limiting name in any respect.

The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc., which may be referred to throughout the above description, may refer to voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may also be represented by a combination of

Further, information, signals, etc. may be output from the upper layer to the lower layer and from the lower layer to at least one of the upper layer. Information, signals, etc. may be input and output via multiple network nodes.

Input/output information, signals, etc. may be stored in a specific location (eg, memory) or may be managed using a management table. Information, signals, etc. that are input and output can be overwritten, updated, or added. The output information, signals, etc. may be deleted. The input information, signals, etc. may be transmitted to other devices.

Notification of information is not limited to the aspects/embodiments described in this disclosure, and may be performed using other methods. For example, the notification of information may be physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), upper layer signaling (e.g., Radio Resource Control (RRC) signaling, It may be implemented by broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), MAC (Medium Access Control) signaling), other signals, or a combination thereof.

Note that the physical layer signaling may also be referred to as L1/L2 (Layer 1/Layer 2) control information (L1/L2 control signal), L1 control information (L1 control signal), etc. Further, RRC signaling may be called an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like. Further, MAC signaling may be notified using, for example, a MAC control element (MAC CE (Control Element)).

Further, notification of prescribed information (for example, notification of "X") is not limited to explicit notification, but may be made implicitly (for example, by not notifying the prescribed information or by providing other information) (by notification).

The determination may be made by a value expressed by 1 bit (0 or 1), or by a boolean value expressed by true or false. , may be performed by numerical comparison (for example, comparison with a predetermined value).

Software includes instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, whether referred to as software, firmware, middleware, microcode, hardware description language, or by any other name. , should be broadly construed to mean an application, software application, software package, routine, subroutine, object, executable, thread of execution, procedure, function, etc.

Additionally, software, instructions, information, etc. may be sent and received via a transmission medium. For example, if the software uses wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and/or wireless technology (infrared, microwave, etc.) to When transmitted from a server or other remote source, these wired and/or wireless technologies are included within the definition of transmission medium.

As used in this disclosure, the terms "system" and "network" may be used interchangeably.

In this disclosure, "precoding", "precoder", "weight (precoding weight)", "quasi-co-location (QCL)", "TCI state (Transmission Configuration Indication state)", "spatial relationship (spatial relation),” “spatial domain filter,” “transmission power,” “phase rotation,” “antenna port,” “antenna port group,” “layer,” “number of layers,” “ Terms such as "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", and "panel" are used interchangeably. can be used for.

In this disclosure, "Base Station (BS)," "wireless base station," "fixed station," "NodeB," "eNodeB (eNB)," "gNodeB (gNB)," " "access point", "transmission point (TP)", "reception point (RP)", "transmission/reception point (TRP)", "panel", "cell" , "sector," "cell group," "carrier," "component carrier," and the like may be used interchangeably. A base station is sometimes referred to by terms such as macrocell, small cell, femtocell, and picocell.

A base station can accommodate one or more (eg, three) cells. If a base station accommodates multiple cells, the overall coverage area of the base station can be partitioned into multiple smaller areas, and each smaller area is divided into multiple subsystems (e.g., small indoor base stations (RRHs)). Communication services can also be provided by remote radio heads). The term "cell" or "sector" refers to part or all of the coverage area of a base station and/or base station subsystem that provides communication services in this coverage.

In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably. .

A mobile station is a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal. , handset, user agent, mobile client, client, or some other suitable terminology.

At least one of a base station and a mobile station may be called a transmitting device, a receiving device, a communication device, or the like. Note that at least one of the base station and the mobile station may be a device mounted on a mobile body, the mobile body itself, or the like. The moving object may be a vehicle (for example, a car, an airplane, etc.), an unmanned moving object (for example, a drone, a self-driving car, etc.), or a robot (manned or unmanned). ). Note that at least one of the base station and the mobile station includes devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

Furthermore, the base station in the present disclosure may be replaced by a user terminal. For example, communication between a base station and a user terminal is replaced with communication between multiple user terminals (for example, it may be called D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.). Regarding the configuration, each aspect/embodiment of the present disclosure may be applied. In this case, the user terminal 20 may have the functions that the base station 10 described above has. Further, words such as "upstream" and "downstream" may be replaced with words corresponding to inter-terminal communication (for example, "side"). For example, uplink channels, downlink channels, etc. may be replaced with side channels.

Similarly, the user terminal in the present disclosure may be replaced by a base station. In this case, the base station 10 may have the functions that the user terminal 20 described above has.

In this disclosure, the operations performed by the base station may be performed by its upper node in some cases. In a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (e.g. It is clear that this can be carried out by MME (Mobility Management Entity), S-GW (Serving-Gateway), etc. (though not limited to these) or a combination thereof.

Each aspect/embodiment described in this disclosure may be used alone, may be used in combination, or may be switched and used in accordance with execution. Further, the order of the processing procedures, sequences, flowcharts, etc. of each aspect/embodiment described in this disclosure may be changed as long as there is no contradiction. For example, the methods described in this disclosure use an example order to present elements of the various steps and are not limited to the particular order presented.

Each aspect/embodiment described in this disclosure applies to LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication). system), 5G (5th generation mobile communication system), FRA (Future Radio Access), New-RAT (Radio Access Technology), NR (New Radio), NX (New radio access), FX (Future generation radio access), GSM (registered trademark) (Global System for Mobile communications), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802. 20, UWB (Ultra-Wide Band), Bluetooth (registered trademark), and other appropriate wireless communication methods, and next-generation systems expanded based on these may be applied. Furthermore, a combination of multiple systems (for example, a combination of LTE or LTE-A and 5G) may be applied.

As used in this disclosure, the phrase "based on" does not mean "based solely on" unless explicitly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

As used in this disclosure, any reference to elements using the designations "first," "second," etc. does not generally limit the amount or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, reference to a first and second element does not imply that only two elements may be employed or that the first element must precede the second element in any way.

As used in this disclosure, the term "determining" may encompass a wide variety of actions. For example, "judgment" can mean judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry ( For example, searching in a table, database, or other data structure), ascertaining, etc. may be considered to be "determining."

In addition, "judgment (decision)" includes receiving (e.g., receiving information), transmitting (e.g., sending information), input (input), output (output), access ( may be considered to be "determining", such as accessing data in memory (eg, accessing data in memory).

In addition, "judgment" is considered to mean "judging" resolving, selecting, choosing, establishing, comparing, etc. Good too. In other words, "judgment (decision)" may be considered to be "judgment (decision)" of some action.

Further, "judgment (decision)" may be read as "assuming", "expecting", "considering", etc.

As used in this disclosure, the terms "connected", "coupled", or any variations thereof refer to any connection or coupling, direct or indirect, between two or more elements. can include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connection" may be replaced with "access."

In this disclosure, when two elements are connected, they may be connected using one or more electrical wires, cables, printed electrical connections, etc., as well as in the radio frequency domain, microwave can be considered to be "connected" or "coupled" to each other using electromagnetic energy having wavelengths in the light (both visible and invisible) range.

In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." Note that the term may also mean that "A and B are each different from C". Terms such as "separate" and "coupled" may also be interpreted similarly to "different."

Where "include", "including" and variations thereof are used in this disclosure, these terms are inclusive, as is the term "comprising". It is intended that Furthermore, the term "or" as used in this disclosure is not intended to be exclusive or.

In this disclosure, when articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are plural.

Although the invention according to the present disclosure has been described in detail above, it is clear for those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented as modifications and variations without departing from the spirit and scope of the invention as determined based on the claims. Therefore, the description of the present disclosure is for the purpose of illustrative explanation and does not have any limiting meaning on the invention according to the present disclosure.

Claims (4)

a transmitting unit that performs physical uplink control channel (PUCCH) transmission in multi-slot;
A terminal comprising: a control unit configured to control a spatial relationship of PUCCHs used for PUCCH transmission in the multi-slot so that it is not changed during PUCCH transmission in the multi-slot. The control unit is a Medium Access Control (MAC) control element (CE) used for spatially related activation or deactivation of the PUCCH , and is configured to perform spatially related activation during PUCCH transmission in the multi-slot. The terminal according to claim 1, wherein when receiving the MAC CE for which activation or deactivation has been completed , the terminal controls the spatial relationship of the PUCCH so as not to change during PUCCH transmission in the multi-slot . performing physical uplink control channel (PUCCH) transmission in multiple slots;
A wireless communication method for a terminal, comprising the step of controlling so that a spatial relationship of PUCCHs used for PUCCH transmission in the multi-slot is not changed during PUCCH transmission in the multi-slot. A system having a base station and a terminal,
The base station is
It has a receiving unit that receives a physical uplink control channel (PUCCH) in a multi-slot,
The terminal is
a transmitting unit that performs PUCC H transmission in the multi-slot ;
A system comprising: a control unit that controls a spatial relationship of PUCCHs used for PUCCH transmission in the multi-slot so that it is not changed during PUCCH transmission in the multi-slot.

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